---
product_id: 16367922
title: "Hydrofarm HGCOV4 Rockwool Block Cover (40 Pack), 4\""
brand: "hydrofarm"
price: "₩45452"
currency: KRW
in_stock: true
url: https://www.desertcart.kr/products/16367922-hydrofarm-hgcov4-rockwool-block-cover-40-pack-4
store_origin: KR
region: South Korea
---

# Reflects light to boost growth Prevents algae & mildew buildup Blocks 100% light penetration Hydrofarm HGCOV4 Rockwool Block Cover (40 Pack), 4"

**Brand:** hydrofarm
**Price:** ₩45452
**Availability:** ✅ In Stock

## Summary

> 🌱 Grow smarter, not harder — keep your roots in the dark and your plants in the spotlight!

## Quick Answers

- **What is this?** Hydrofarm HGCOV4 Rockwool Block Cover (40 Pack), 4" by hydrofarm
- **How much does it cost?** ₩45452 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.kr](https://www.desertcart.kr/products/16367922-hydrofarm-hgcov4-rockwool-block-cover-40-pack-4)

## Best For

- hydrofarm enthusiasts

## Why This Product

- Trusted hydrofarm brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Bulk 40-Pack:** Stock up and never run out during critical growth cycles
- • **Durable 4" Size:** Perfectly sized for standard Rockwool blocks, easy to handle and install
- • **Total Light Blockade:** Ensures roots stay in perfect darkness for optimal growth
- • **Algae & Mildew Defense:** Keeps your grow media pristine and disease-free
- • **Enhanced Light Reflection:** Maximizes light efficiency by bouncing it back to your plants’ leaves

## Overview

The Hydrofarm HGCOV4 Rockwool Block Cover is a 4-inch cover designed to block light completely from your Rockwool media, reflecting light back to plant leaves to enhance photosynthesis while preventing algae and mildew growth. Sold in a convenient 40-pack, it’s an essential tool for professional growers aiming for cleaner, healthier, and more productive crops.

## Description

HGCOV4 Rockwool Block Cover (40 Pack), 4"

## Features

- Blocks light from media
- Reflects light to plant leaves
- Eliminates algae and mildew growth

## Product Details

- **Brand:** Hydrofarm
- **Item Weight:** 0.07 Kilograms
- **Item Form:** rectangular
- **Coverage:** Full
- **Specific Uses For Product:** Plant Growth

## Images

![Hydrofarm HGCOV4 Rockwool Block Cover (40 Pack), 4" - Image 1](https://m.media-amazon.com/images/I/51zcRsEGUzL.jpg)

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**Shop now:** [https://www.desertcart.kr/products/16367922-hydrofarm-hgcov4-rockwool-block-cover-40-pack-4](https://www.desertcart.kr/products/16367922-hydrofarm-hgcov4-rockwool-block-cover-40-pack-4)

---

*Product available on Desertcart South Korea*
*Store origin: KR*
*Last updated: 2026-01-29*